Impl basic drawing, a basic start to the program

.gitignore

@@ -1 +1,3 @@
 build*/
+compile_commands.json
+.clangd/

include/imgui-SFML.h

@@ -0,0 +1 @@
+../third_party/imgui-sfml/imgui-SFML.h

src/main.cpp

@@ -2,6 +2,45 @@
 #include <SFML/Window.hpp>
 #include <SFML/Graphics.hpp>
 
+#include <imgui.h>
+#include <imgui-SFML.h>
+
 int main(int argc, char **argv) {
+    // init
+    sf::RenderWindow window(sf::VideoMode(800, 600), "Triangles");
+    ImGui::SFML::Init(window);
+    window.setFramerateLimit(60);
+    const sf::Time dt = sf::microseconds(16666);
+
+    // main loop
+    sf::Event event;
+    while(window.isOpen()) {
+        // events
+        window.pollEvent(event);
+        ImGui::SFML::ProcessEvent(event);
+        if(event.type == sf::Event::Closed) {
+            window.close();
+        }
+
+        // update
+        ImGui::SFML::Update(window, dt);
+
+        ImGui::Begin("Test window");
+        ImGui::Text("Test text");
+
+        ImGui::End();
+        ImGui::EndFrame();
+        // update end
+
+        // draw
+        window.clear();
+        ImGui::SFML::Render(window);
+        window.display();
+    }
+
+    // cleanup
+    window.close();
+    ImGui::SFML::Shutdown();
+
     return 0;
 }